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      AOP系列四之CGLIB
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        <h2 id="u7B80_u4ECB"><a href="#u7B80_u4ECB" class="headerlink" title="简介"></a>简介</h2><p>　　CGLIB包的底层是通过使用一个小而快的字节码处理框架ASM(Java字节码操控框架)，来转换字节码并生成新的子类，并将切面逻辑加入到子类中（动态字节码生成技术），所以使用Cglib实现AOP不需要基于接口。除了CGLIB包，脚本语言例如 Groovy和BeanShell，也是使用ASM来生成java的字节码。不鼓励直接使用ASM，因为它要求你必须对JVM内部结构包括class文件的格式和指令集都很熟悉。所以cglib包要依赖于asm包，需要一起导入。下图为cglib与一些框架和语言的关系（CGLIB Library and ASM Bytecode Framework）。</p>
<p><img src="/images/cglib-structure.gif" alt="cglib-structure.gif"></p>
<h2 id="u793A_u4F8B"><a href="#u793A_u4F8B" class="headerlink" title="示例"></a>示例</h2><p>　　JDK实现动态代理需要实现类通过接口定义业务方法，对于没有接口的类，如何实现动态代理呢，这就需要CGLib了。CGLib采用了非常底层的字节码技术，其原理是通过字节码技术为一个类创建子类，并在子类中采用方法拦截的技术拦截所有父类方法的调用，顺势织入横切逻辑。JDK动态代理与CGLib动态代理均是实现Spring AOP的基础。</p>
<p>对类进行代理<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CglibProxyDemo</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY, <span class="string">"C:/class"</span>);</span><br><span class="line">        CglibProxy proxy = <span class="keyword">new</span> CglibProxy();</span><br><span class="line">        <span class="comment">//通过生成子类的方式创建代理类</span></span><br><span class="line">        SayHello proxyImp = (SayHello)proxy.getProxy(SayHello.class);</span><br><span class="line">        proxyImp.say();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">//定义一个被代理的父类</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">SayHello</span> </span>&#123;</span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">say</span><span class="params">()</span></span>&#123;</span><br><span class="line">            System.out.println(<span class="string">"hello everyone"</span>);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">CglibProxy</span> <span class="keyword">implements</span> <span class="title">MethodInterceptor</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">private</span> Enhancer enhancer = <span class="keyword">new</span> Enhancer();</span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> Object <span class="title">getProxy</span><span class="params">(Class clazz)</span></span>&#123;</span><br><span class="line">            <span class="comment">//设置需要创建子类的类</span></span><br><span class="line">            enhancer.setSuperclass(clazz);</span><br><span class="line">            enhancer.setCallback(<span class="keyword">this</span>);</span><br><span class="line">            <span class="comment">//通过字节码技术动态创建子类实例</span></span><br><span class="line">            <span class="keyword">return</span> enhancer.create();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="annotation">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> Object <span class="title">intercept</span><span class="params">(Object obj, Method method, Object[] args,</span><br><span class="line">                                MethodProxy proxy)</span> <span class="keyword">throws</span> Throwable </span>&#123;</span><br><span class="line">            System.out.println(<span class="string">"前置代理"</span>);</span><br><span class="line">            <span class="comment">//通过代理类调用父类中的方法</span></span><br><span class="line">            Object result = proxy.invokeSuper(obj, args);</span><br><span class="line">            System.out.println(<span class="string">"后置代理"</span>);</span><br><span class="line">            <span class="keyword">return</span> result;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>对接口进行代理<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CglibProxyDemo2</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY, <span class="string">"C:/class"</span>);</span><br><span class="line">        CglibProxy proxy = <span class="keyword">new</span> CglibProxy();</span><br><span class="line"></span><br><span class="line">        ISayHello proxyImp = (ISayHello)proxy.getProxy(ISayHello.class);</span><br><span class="line">        proxyImp.say();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">interface</span> <span class="title">ISayHello</span> </span>&#123;</span><br><span class="line">        <span class="function"><span class="keyword">void</span> <span class="title">say</span><span class="params">()</span></span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">CglibProxy</span> <span class="keyword">implements</span> <span class="title">MethodInterceptor</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">private</span> Enhancer enhancer = <span class="keyword">new</span> Enhancer();</span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> Object <span class="title">getProxy</span><span class="params">(Class clazz)</span></span>&#123;</span><br><span class="line">            <span class="comment">//设置需要创建子类的类</span></span><br><span class="line">            enhancer.setSuperclass(clazz);</span><br><span class="line">            enhancer.setCallback(<span class="keyword">this</span>);</span><br><span class="line">            <span class="comment">//通过字节码技术动态创建子类实例</span></span><br><span class="line">            <span class="keyword">return</span> enhancer.create();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="annotation">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> Object <span class="title">intercept</span><span class="params">(Object obj, Method method, Object[] args,</span><br><span class="line">                                MethodProxy proxy)</span> <span class="keyword">throws</span> Throwable </span>&#123;</span><br><span class="line">            System.out.println(<span class="string">"前置代理"</span>);</span><br><span class="line">            <span class="comment">//此时代理的为接口，不可调用</span></span><br><span class="line">            <span class="comment">//Object result = proxy.invokeSuper(obj, args);</span></span><br><span class="line">            System.out.println(<span class="string">"后置代理"</span>);</span><br><span class="line">            <span class="keyword">return</span> <span class="string">""</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h2 id="u5B9E_u73B0_u539F_u7406"><a href="#u5B9E_u73B0_u539F_u7406" class="headerlink" title="实现原理"></a>实现原理</h2><p>　　在上面的代码中，通过System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY, “C:/class”);语句，将Cglib动态生成的字节码保存到本地并且反编译查看，或者通过调试的方式（详见下图），可以看出，Cglib是通过动态创建子类的方式进行动态代理，在这点上，与JDK的方式一样。<br><img src="/images/cglib-proxy.png" alt="cglib-proxy"></p>
<h2 id="u603B_u7ED3"><a href="#u603B_u7ED3" class="headerlink" title="总结"></a>总结</h2><p>　　CGLib创建的动态代理对象性能比JDK创建的动态代理对象的性能高不少，但是CGLib在创建代理对象时所花费的时间却比JDK多得多，所以对于单例的对象，因为无需频繁创建对象，用CGLib合适，反之，使用JDK方式要更为合适一些。同时，由于CGLib由于是采用动态创建子类的方法，对于final方法，无法进行代理。</p>
<h2 id="u7CFB_u5217_u6587_u7AE0"><a href="#u7CFB_u5217_u6587_u7AE0" class="headerlink" title="系列文章"></a>系列文章</h2><p><a href="/../1.AOP系列之概述/">1. AOP系列之概述</a><br><a href="/../2.AOP系列之AspectJ/">2. AOP系列之AspectJ</a><br><a href="/../3.AOP系列之JDK Proxy/">3. AOP系列之JDK Proxy</a><br><a href="/../4.AOP系列之CGLIB/">4. AOP系列之CGLIB</a><br><a href="/../5.AOP系列之CGLIB源码学习/">5. AOP系列之CGLIB源码学习</a><br><a href="/../6.AOP系列之Spring AOP/">6. AOP系列之Spring AOP</a><br><a href="/../7.AOP系列之Spring AspectJ/">7. AOP系列之Spring AspectJ</a></p>
<h2 id="u53C2_u8003_u8D44_u6599"><a href="#u53C2_u8003_u8D44_u6599" class="headerlink" title="参考资料"></a>参考资料</h2><p><a href="http://blog.csdn.net/xiaohai0504/article/details/6832990" target="_blank" rel="external">http://blog.csdn.net/xiaohai0504/article/details/6832990</a><br><a href="http://blog.csdn.net/xiaohai0504/article/details/6833822" target="_blank" rel="external">http://blog.csdn.net/xiaohai0504/article/details/6833822</a></p>

      
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